5 Choose 2 — What is 5C2?
5C2 equals 10, meaning there are 10 ways to choose 2 items from a set of 5.
How to use this tool
- Enter n (total items) and r (items chosen) in the fields above.
- Results update instantly as you type — or click Calculate.
- Read your ncr and the full breakdown beneath it.
Compute 5C2 to quickly find the number of unordered pairs that can be selected from 5 items.
Frequently asked questions
- What is a combination?
- A combination is an unordered selection. nCr = n!/(r!(n-r)!). For example, C(5,2) = 10 — choosing 2 from 5 ignoring order.